Version 0.41 released

I've just released Version 0.41. Main changes are:

• UI update

• Onboarding improvement / simplification

• Enemy targeting improvements - you can now apply selected targeting to all towers, or all towers of the same type

• Sniper: 10% extra damage each time a given sniper tower hits the same enemy

• Cracked tiles: if you delete tiles on the same grid location 4 times or more you will no longer be able to build on top of them.

• Starting the next wave early now doesn't cost you time. E.g. if you start the wave 5 seconds early your mana bar will refill as if those 5 seconds had occurred rather than been skipped.

• Right click now rotates your tetrominoes

• Option to remove damage numbers (should help performance at excessively high wave numbers!)

• Option to disable the slow-down while placing a tetromino